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Acute exposure to a hot ambient temperature reduces energy intake but does not affect gut hormones in men during rest

  • Julia Fruer
    ,
  • Rachel Horsfall
    ,
  • Diane Cottrill
    ,
  • John Hough
  • University of Bedfordshire
Research Output: Contribution to journal Article Peer-review

Open access

Abstract

This study examined the effect of ambient temperature on energy intake, perceived appetite and gut hormone responses during rest in men. Thirteen men (age 21.5 (SD 1.4) years; BMI 24.7 (SD 2.2) kg∙m-2) completed three, 5.5-h conditions in different ambient temperatures: i) cold (10˚C), ii) thermoneutral (20˚C), and iii) hot (30˚C). A standardised breakfast was consumed after fasting measures, and an ad libitum lunch provided at 4 to 4.5 h. Blood samples (analysed for plasma acylated ghrelin, total peptide tyrosine-tyrosine (PYY) and total glucagon-like peptide (GLP-1) concentrations), perceived appetite and thermoregulatory responses were collected throughout. Linear mixed models were used for statistical analyses. Ad libitum energy intake was 1243 (SD 1342) kJ higher in 10˚C and 1189 (SD 1219) kJ higher in 20˚C versus 30C (P = 0.002). Plasma acylated ghrelin, total PYY and GLP-1 concentrations did not differ significantly between the conditions (P ≥ 0.303). Sensitivity analyses for the 4-h pre-lunch period showed that perceived overall appetite was lower in both 30˚C and 10C when compared with 20˚C (P ≤ 0.019). In conclusion, acutely resting in a hot compared with a thermoneutral and cold ambient temperature reduced lunchtime ad libitum energy intake in healthy men. Suppressed perceived appetite may have contributed to the reduced energy intake in the hot compared with thermoneutral ambient temperature, whereas gut hormones did not appear to play an important role.

Publication Information

Output type

Research Output: Contribution to journal Article Peer-review

Original language

English

Pages from-to (Number of pages)

Pages 951-959

Journal (Volume, Issue Number)

British Journal of Nutrition (Volume 125, Issue 8)

Publication milestones

  • Accepted/In press - 16/07/2020
  • Published - 22/07/2020

Publication status

Published - 22/07/2020

ISSN

0007-1145

External Publication IDs

  • handle.net: 10547/624269
  • Scopus: 85094606642

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